<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 添加角色按钮区域 -->
        <el-row>
            <el-col>
                <el-button type="primary">添加角色</el-button>
            </el-col>
        </el-row>

        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
                <!-- eslint-disable-next-line -->
                <template slot-scope="scope">
                    <!-- eslint-disable-next-line -->
                    <el-row :class="['bdbottom', i1 === 0 ? 'bdtop': '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级三级权限 -->
                        <el-col :span="19">
                            <!-- 二级权限 -->
                            <el-row :class="[i2 === 0 ? '': 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <!-- eslint-disable-next-line -->                    
                                    <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                            
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <!-- eslint-disable-next-line -->
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed"
        >
    
    <el-tree :data="rightslist" :props="treeProps" 
    show-checkbox node-key="id" default-expand-all
    :default-checked-keys="defKeys" ref="treeRef"></el-tree>

    <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
    </span>
</el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            rightslist: [],
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点Id数值
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''

        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        //获取所有角色的列表
        async getRolesList() {
            const { data:res } = await this.$http.get('/roles')

            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }

            this.rolelist = res.data
            console.log(this.rolelist);
        },
        // 根据id删除用户对应权限
        async removeRightById(role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err =>err)

        if (confirmResult !== 'confirm') {
            return this.$message.info('取消了删除')
        }

        const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        
        if (res.meta.status !== 200) {
            return this.$message.error('删除权限失败')
        }

        role.children = res.data
        },

        async showSetRightDialog(role) {
            this.roleId = role.id
            const {data: res} = await this.$http.get('rights/tree')

            if(res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }
            this.rightslist = res.data

            // 递归获取三级节点ID
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色所有三级权限id，并保存到defKeys数组中
        getLeafKeys(node, arr) {
        // 如果当前 node 节点不包含 children 属性，则是三级节点
        if (!node.children) {
            return arr.push(node.id)
        }

        node.children.forEach( item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    async allotRights() {
        const keys = [
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
        ]

        const idStr = keys.join(',')

        const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})

        if (res.meta.status !== 200) {
            return this.$$message.error('分配权限失败')
        }
        this.$message.success('分配权限成功')
        this.getRolesList()
        this.setRightDialogVisible = false
    }

    }
}
</script>

<style lang="less" scoped>

.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>